Cyber-physical security analysis

Cyber-physical security analysis is an integrated risk assessment methodology for systems where digital controls directly influence physical processes. Its core focus is analyzing how a cyber threat, such as a malicious network packet, can translate into a tangible, often hazardous, physical action, like disabling a vehicle's brakes. This approach is formally mandated by the automotive standard ISO/SAE 21434, whose Clause 15 outlines the Threat Analysis and Risk Assessment (TARA) process. TARA requires engineers to systematically identify vulnerabilities at the intersection of cyber and physical domains and assess their potential safety impact. Unlike traditional IT security focused on the CIA triad (Confidentiality, Integrity, Availability) of data, this analysis prioritizes preventing physical harm to persons and property. It is a foundational component for establishing a Cybersecurity Management System (CSMS) compliant with UN Regulation No. 155.

Practical application involves a three-step process. First, System Definition: Define the target item (e.g., braking system) and identify all cyber-physical assets, including ECUs, sensors, and communication buses, as per ISO/SAE 21434. Second, Threat Modeling & Risk Assessment: Use methodologies like STRIDE to model attack paths and assess the safety impact based on damage scenarios from UN R155. Third, Control Implementation: Based on risk levels, define security goals (e.g., “Prevent unauthorized brake commands”) and implement countermeasures like Hardware Security Modules (HSMs) and secure boot. Global OEMs integrate this into their V-model development, achieving over a 99% first-pass rate for UN R155 audits and reducing projected recall-related financial losses by over 30%.

Taiwanese enterprises, often Tier 1/2 suppliers, face three key challenges. First, a talent gap in professionals skilled across automotive engineering and cybersecurity. Second, supply chain complexity, with limited visibility into the full OEM vehicle architecture, which restricts analysis scope. Third, the high cost of establishing Hardware-in-the-Loop (HIL) testbeds for realistic attack simulation. To overcome these, companies should partner with expert consultants for training (Priority 1), mandate standardized security information exchange (e.g., VEX) in contracts (Priority 2), and leverage shared testing facilities from research institutions for cost-effective validation (Priority 3).

Winners Consulting specializes in Cyber-physical security analysis for Taiwan enterprises, delivering compliant management systems within 90 days. Free consultation: https://winners.com.tw/contact